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1 /*
2  * (C) Copyright IBM Corporation 2002, 2004
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * on the rights to use, copy, modify, merge, publish, distribute, sub
9  * license, and/or sell copies of the Software, and to permit persons to whom
10  * the Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice (including the next
13  * paragraph) shall be included in all copies or substantial portions of the
14  * Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
19  * THE AUTHORS AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 /**
26  * \file dri_util.c
27  * DRI utility functions.
28  *
29  * This module acts as glue between GLX and the actual hardware driver.  A DRI
30  * driver doesn't really \e have to use any of this - it's optional.  But, some
31  * useful stuff is done here that otherwise would have to be duplicated in most
32  * drivers.
33  *
34  * Basically, these utility functions take care of some of the dirty details of
35  * screen initialization, context creation, context binding, DRM setup, etc.
36  *
37  * These functions are compiled into each DRI driver so libGL.so knows nothing
38  * about them.
39  */
40 
41 
42 #include <stdbool.h>
43 #include "dri_util.h"
44 #include "utils.h"
45 #include "xmlpool.h"
46 #include "main/mtypes.h"
47 #include "main/framebuffer.h"
48 #include "main/version.h"
49 #include "main/debug_output.h"
50 #include "main/errors.h"
51 #include "main/macros.h"
52 
53 const char __dri2ConfigOptions[] =
54    DRI_CONF_BEGIN
55       DRI_CONF_SECTION_PERFORMANCE
DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)56          DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_DEF_INTERVAL_1)
57       DRI_CONF_SECTION_END
58    DRI_CONF_END;
59 
60 /*****************************************************************/
61 /** \name Screen handling functions                              */
62 /*****************************************************************/
63 /*@{*/
64 
65 static void
66 setupLoaderExtensions(__DRIscreen *psp,
67 		      const __DRIextension **extensions)
68 {
69     int i;
70 
71     for (i = 0; extensions[i]; i++) {
72 	if (strcmp(extensions[i]->name, __DRI_DRI2_LOADER) == 0)
73 	    psp->dri2.loader = (__DRIdri2LoaderExtension *) extensions[i];
74 	if (strcmp(extensions[i]->name, __DRI_IMAGE_LOOKUP) == 0)
75 	    psp->dri2.image = (__DRIimageLookupExtension *) extensions[i];
76 	if (strcmp(extensions[i]->name, __DRI_USE_INVALIDATE) == 0)
77 	    psp->dri2.useInvalidate = (__DRIuseInvalidateExtension *) extensions[i];
78 	if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
79 	    psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
80         if (strcmp(extensions[i]->name, __DRI_IMAGE_LOADER) == 0)
81            psp->image.loader = (__DRIimageLoaderExtension *) extensions[i];
82     }
83 }
84 
85 /**
86  * This pointer determines which driver API we'll use in the case of the
87  * loader not passing us an explicit driver extensions list (that would,
88  * itself, contain a pointer to a driver API.)
89  *
90  * A driver's driDriverGetExtensions_drivername() can update this pointer to
91  * what it's returning, and a loader that is ignorant of createNewScreen2()
92  * will get the correct driver screen created, as long as no other
93  * driDriverGetExtensions() happened in between the first one and the
94  * createNewScreen().
95  *
96  * This allows the X Server to not require the significant dri_interface.h
97  * updates for doing createNewScreen2(), which would discourage backporting of
98  * the X Server patches to support the new loader interface.
99  */
100 const struct __DriverAPIRec *globalDriverAPI = &driDriverAPI;
101 
102 /**
103  * This is the first entrypoint in the driver called by the DRI driver loader
104  * after dlopen()ing it.
105  *
106  * It's used to create global state for the driver across contexts on the same
107  * Display.
108  */
109 static __DRIscreen *
driCreateNewScreen2(int scrn,int fd,const __DRIextension ** extensions,const __DRIextension ** driver_extensions,const __DRIconfig *** driver_configs,void * data)110 driCreateNewScreen2(int scrn, int fd,
111                     const __DRIextension **extensions,
112                     const __DRIextension **driver_extensions,
113                     const __DRIconfig ***driver_configs, void *data)
114 {
115     static const __DRIextension *emptyExtensionList[] = { NULL };
116     __DRIscreen *psp;
117 
118     psp = calloc(1, sizeof(*psp));
119     if (!psp)
120 	return NULL;
121 
122     /* By default, use the global driDriverAPI symbol (non-megadrivers). */
123     psp->driver = globalDriverAPI;
124 
125     /* If the driver exposes its vtable through its extensions list
126      * (megadrivers), use that instead.
127      */
128     if (driver_extensions) {
129        for (int i = 0; driver_extensions[i]; i++) {
130           if (strcmp(driver_extensions[i]->name, __DRI_DRIVER_VTABLE) == 0) {
131              psp->driver =
132                 ((__DRIDriverVtableExtension *)driver_extensions[i])->vtable;
133           }
134        }
135     }
136 
137     setupLoaderExtensions(psp, extensions);
138 
139     psp->loaderPrivate = data;
140 
141     psp->extensions = emptyExtensionList;
142     psp->fd = fd;
143     psp->myNum = scrn;
144 
145     *driver_configs = psp->driver->InitScreen(psp);
146     if (*driver_configs == NULL) {
147 	free(psp);
148 	return NULL;
149     }
150 
151     struct gl_constants consts = { 0 };
152     gl_api api;
153     unsigned version;
154 
155     api = API_OPENGLES2;
156     if (_mesa_override_gl_version_contextless(&consts, &api, &version))
157        psp->max_gl_es2_version = version;
158 
159     api = API_OPENGL_COMPAT;
160     if (_mesa_override_gl_version_contextless(&consts, &api, &version)) {
161        if (api == API_OPENGL_CORE) {
162           psp->max_gl_core_version = version;
163        } else {
164           psp->max_gl_compat_version = version;
165        }
166     }
167 
168     psp->api_mask = 0;
169     if (psp->max_gl_compat_version > 0)
170        psp->api_mask |= (1 << __DRI_API_OPENGL);
171     if (psp->max_gl_core_version > 0)
172        psp->api_mask |= (1 << __DRI_API_OPENGL_CORE);
173     if (psp->max_gl_es1_version > 0)
174        psp->api_mask |= (1 << __DRI_API_GLES);
175     if (psp->max_gl_es2_version > 0)
176        psp->api_mask |= (1 << __DRI_API_GLES2);
177     if (psp->max_gl_es2_version >= 30)
178        psp->api_mask |= (1 << __DRI_API_GLES3);
179 
180     driParseOptionInfo(&psp->optionInfo, __dri2ConfigOptions);
181     driParseConfigFiles(&psp->optionCache, &psp->optionInfo, psp->myNum, "dri2");
182 
183 
184     return psp;
185 }
186 
187 static __DRIscreen *
dri2CreateNewScreen(int scrn,int fd,const __DRIextension ** extensions,const __DRIconfig *** driver_configs,void * data)188 dri2CreateNewScreen(int scrn, int fd,
189 		    const __DRIextension **extensions,
190 		    const __DRIconfig ***driver_configs, void *data)
191 {
192    return driCreateNewScreen2(scrn, fd, extensions, NULL,
193                                driver_configs, data);
194 }
195 
196 /** swrast driver createNewScreen entrypoint. */
197 static __DRIscreen *
driSWRastCreateNewScreen(int scrn,const __DRIextension ** extensions,const __DRIconfig *** driver_configs,void * data)198 driSWRastCreateNewScreen(int scrn, const __DRIextension **extensions,
199                          const __DRIconfig ***driver_configs, void *data)
200 {
201    return driCreateNewScreen2(scrn, -1, extensions, NULL,
202                                driver_configs, data);
203 }
204 
205 static __DRIscreen *
driSWRastCreateNewScreen2(int scrn,const __DRIextension ** extensions,const __DRIextension ** driver_extensions,const __DRIconfig *** driver_configs,void * data)206 driSWRastCreateNewScreen2(int scrn, const __DRIextension **extensions,
207                           const __DRIextension **driver_extensions,
208                           const __DRIconfig ***driver_configs, void *data)
209 {
210    return driCreateNewScreen2(scrn, -1, extensions, driver_extensions,
211                                driver_configs, data);
212 }
213 
214 /**
215  * Destroy the per-screen private information.
216  *
217  * \internal
218  * This function calls __DriverAPIRec::DestroyScreen on \p screenPrivate, calls
219  * drmClose(), and finally frees \p screenPrivate.
220  */
driDestroyScreen(__DRIscreen * psp)221 static void driDestroyScreen(__DRIscreen *psp)
222 {
223     if (psp) {
224 	/* No interaction with the X-server is possible at this point.  This
225 	 * routine is called after XCloseDisplay, so there is no protocol
226 	 * stream open to the X-server anymore.
227 	 */
228 
229 	psp->driver->DestroyScreen(psp);
230 
231 	driDestroyOptionCache(&psp->optionCache);
232 	driDestroyOptionInfo(&psp->optionInfo);
233 
234 	free(psp);
235     }
236 }
237 
driGetExtensions(__DRIscreen * psp)238 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
239 {
240     return psp->extensions;
241 }
242 
243 /*@}*/
244 
245 
246 static bool
validate_context_version(__DRIscreen * screen,int mesa_api,unsigned major_version,unsigned minor_version,unsigned * dri_ctx_error)247 validate_context_version(__DRIscreen *screen,
248                          int mesa_api,
249                          unsigned major_version,
250                          unsigned minor_version,
251                          unsigned *dri_ctx_error)
252 {
253    unsigned req_version = 10 * major_version + minor_version;
254    unsigned max_version = 0;
255 
256    switch (mesa_api) {
257    case API_OPENGL_COMPAT:
258       max_version = screen->max_gl_compat_version;
259       break;
260    case API_OPENGL_CORE:
261       max_version = screen->max_gl_core_version;
262       break;
263    case API_OPENGLES:
264       max_version = screen->max_gl_es1_version;
265       break;
266    case API_OPENGLES2:
267       max_version = screen->max_gl_es2_version;
268       break;
269    default:
270       max_version = 0;
271       break;
272    }
273 
274    if (max_version == 0) {
275       *dri_ctx_error = __DRI_CTX_ERROR_BAD_API;
276       return false;
277    } else if (req_version > max_version) {
278       *dri_ctx_error = __DRI_CTX_ERROR_BAD_VERSION;
279       return false;
280    }
281 
282    return true;
283 }
284 
285 /*****************************************************************/
286 /** \name Context handling functions                             */
287 /*****************************************************************/
288 /*@{*/
289 
290 static __DRIcontext *
driCreateContextAttribs(__DRIscreen * screen,int api,const __DRIconfig * config,__DRIcontext * shared,unsigned num_attribs,const uint32_t * attribs,unsigned * error,void * data)291 driCreateContextAttribs(__DRIscreen *screen, int api,
292                         const __DRIconfig *config,
293                         __DRIcontext *shared,
294                         unsigned num_attribs,
295                         const uint32_t *attribs,
296                         unsigned *error,
297                         void *data)
298 {
299     __DRIcontext *context;
300     const struct gl_config *modes = (config != NULL) ? &config->modes : NULL;
301     void *shareCtx = (shared != NULL) ? shared->driverPrivate : NULL;
302     gl_api mesa_api;
303     unsigned major_version = 1;
304     unsigned minor_version = 0;
305     uint32_t flags = 0;
306     bool notify_reset = false;
307 
308     assert((num_attribs == 0) || (attribs != NULL));
309 
310     if (!(screen->api_mask & (1 << api))) {
311 	*error = __DRI_CTX_ERROR_BAD_API;
312 	return NULL;
313     }
314 
315     switch (api) {
316     case __DRI_API_OPENGL:
317 	mesa_api = API_OPENGL_COMPAT;
318 	break;
319     case __DRI_API_GLES:
320 	mesa_api = API_OPENGLES;
321 	break;
322     case __DRI_API_GLES2:
323     case __DRI_API_GLES3:
324 	mesa_api = API_OPENGLES2;
325 	break;
326     case __DRI_API_OPENGL_CORE:
327         mesa_api = API_OPENGL_CORE;
328         break;
329     default:
330 	*error = __DRI_CTX_ERROR_BAD_API;
331 	return NULL;
332     }
333 
334     for (unsigned i = 0; i < num_attribs; i++) {
335 	switch (attribs[i * 2]) {
336 	case __DRI_CTX_ATTRIB_MAJOR_VERSION:
337 	    major_version = attribs[i * 2 + 1];
338 	    break;
339 	case __DRI_CTX_ATTRIB_MINOR_VERSION:
340 	    minor_version = attribs[i * 2 + 1];
341 	    break;
342 	case __DRI_CTX_ATTRIB_FLAGS:
343 	    flags = attribs[i * 2 + 1];
344 	    break;
345         case __DRI_CTX_ATTRIB_RESET_STRATEGY:
346             notify_reset = (attribs[i * 2 + 1]
347                             != __DRI_CTX_RESET_NO_NOTIFICATION);
348             break;
349 	default:
350 	    /* We can't create a context that satisfies the requirements of an
351 	     * attribute that we don't understand.  Return failure.
352 	     */
353 	    assert(!"Should not get here.");
354 	    *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
355 	    return NULL;
356 	}
357     }
358 
359     /* Mesa does not support the GL_ARB_compatibilty extension or the
360      * compatibility profile.  This means that we treat a API_OPENGL_COMPAT 3.1 as
361      * API_OPENGL_CORE and reject API_OPENGL_COMPAT 3.2+.
362      */
363     if (mesa_api == API_OPENGL_COMPAT && major_version == 3 && minor_version == 1)
364        mesa_api = API_OPENGL_CORE;
365 
366     if (mesa_api == API_OPENGL_COMPAT
367         && ((major_version > 3)
368             || (major_version == 3 && minor_version >= 2))) {
369        *error = __DRI_CTX_ERROR_BAD_API;
370        return NULL;
371     }
372 
373     /* The latest version of EGL_KHR_create_context spec says:
374      *
375      *     "If the EGL_CONTEXT_OPENGL_DEBUG_BIT_KHR flag bit is set in
376      *     EGL_CONTEXT_FLAGS_KHR, then a <debug context> will be created.
377      *     [...] This bit is supported for OpenGL and OpenGL ES contexts.
378      *
379      * No other EGL_CONTEXT_OPENGL_*_BIT is legal for an ES context.
380      *
381      * However, Mesa's EGL layer translates the context attribute
382      * EGL_CONTEXT_OPENGL_ROBUST_ACCESS into the context flag
383      * __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS.  That attribute is legal for ES
384      * (with EGL 1.5 or EGL_EXT_create_context_robustness) and GL (only with
385      * EGL 1.5).
386      *
387      * From the EGL_EXT_create_context_robustness spec:
388      *
389      *     This extension is written against the OpenGL ES 2.0 Specification
390      *     but can apply to OpenGL ES 1.1 and up.
391      *
392      * From the EGL 1.5 (2014.08.27) spec, p55:
393      *
394      *     If the EGL_CONTEXT_OPENGL_ROBUST_ACCESS attribute is set to
395      *     EGL_TRUE, a context supporting robust buffer access will be created.
396      *     OpenGL contexts must support the GL_ARB_robustness extension, or
397      *     equivalent core API functional- ity. OpenGL ES contexts must support
398      *     the GL_EXT_robustness extension, or equivalent core API
399      *     functionality.
400      */
401     if (mesa_api != API_OPENGL_COMPAT
402         && mesa_api != API_OPENGL_CORE
403         && (flags & ~(__DRI_CTX_FLAG_DEBUG |
404 	              __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS))) {
405 	*error = __DRI_CTX_ERROR_BAD_FLAG;
406 	return NULL;
407     }
408 
409     /* There are no forward-compatible contexts before OpenGL 3.0.  The
410      * GLX_ARB_create_context spec says:
411      *
412      *     "Forward-compatible contexts are defined only for OpenGL versions
413      *     3.0 and later."
414      *
415      * Forward-looking contexts are supported by silently converting the
416      * requested API to API_OPENGL_CORE.
417      *
418      * In Mesa, a debug context is the same as a regular context.
419      */
420     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0) {
421        mesa_api = API_OPENGL_CORE;
422     }
423 
424     const uint32_t allowed_flags = (__DRI_CTX_FLAG_DEBUG
425                                     | __DRI_CTX_FLAG_FORWARD_COMPATIBLE
426                                     | __DRI_CTX_FLAG_ROBUST_BUFFER_ACCESS);
427     if (flags & ~allowed_flags) {
428 	*error = __DRI_CTX_ERROR_UNKNOWN_FLAG;
429 	return NULL;
430     }
431 
432     if (!validate_context_version(screen, mesa_api,
433                                   major_version, minor_version, error))
434        return NULL;
435 
436     context = calloc(1, sizeof *context);
437     if (!context) {
438 	*error = __DRI_CTX_ERROR_NO_MEMORY;
439 	return NULL;
440     }
441 
442     context->loaderPrivate = data;
443 
444     context->driScreenPriv = screen;
445     context->driDrawablePriv = NULL;
446     context->driReadablePriv = NULL;
447 
448     if (!screen->driver->CreateContext(mesa_api, modes, context,
449                                        major_version, minor_version,
450                                        flags, notify_reset, error, shareCtx)) {
451         free(context);
452         return NULL;
453     }
454 
455     *error = __DRI_CTX_ERROR_SUCCESS;
456     return context;
457 }
458 
459 void
driContextSetFlags(struct gl_context * ctx,uint32_t flags)460 driContextSetFlags(struct gl_context *ctx, uint32_t flags)
461 {
462     if ((flags & __DRI_CTX_FLAG_FORWARD_COMPATIBLE) != 0)
463         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
464     if ((flags & __DRI_CTX_FLAG_DEBUG) != 0) {
465        _mesa_set_debug_state_int(ctx, GL_DEBUG_OUTPUT, GL_TRUE);
466         ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
467     }
468 }
469 
470 static __DRIcontext *
driCreateNewContextForAPI(__DRIscreen * screen,int api,const __DRIconfig * config,__DRIcontext * shared,void * data)471 driCreateNewContextForAPI(__DRIscreen *screen, int api,
472                           const __DRIconfig *config,
473                           __DRIcontext *shared, void *data)
474 {
475     unsigned error;
476 
477     return driCreateContextAttribs(screen, api, config, shared, 0, NULL,
478                                    &error, data);
479 }
480 
481 static __DRIcontext *
driCreateNewContext(__DRIscreen * screen,const __DRIconfig * config,__DRIcontext * shared,void * data)482 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
483                     __DRIcontext *shared, void *data)
484 {
485     return driCreateNewContextForAPI(screen, __DRI_API_OPENGL,
486                                      config, shared, data);
487 }
488 
489 /**
490  * Destroy the per-context private information.
491  *
492  * \internal
493  * This function calls __DriverAPIRec::DestroyContext on \p contextPrivate, calls
494  * drmDestroyContext(), and finally frees \p contextPrivate.
495  */
496 static void
driDestroyContext(__DRIcontext * pcp)497 driDestroyContext(__DRIcontext *pcp)
498 {
499     if (pcp) {
500 	pcp->driScreenPriv->driver->DestroyContext(pcp);
501 	free(pcp);
502     }
503 }
504 
505 static int
driCopyContext(__DRIcontext * dest,__DRIcontext * src,unsigned long mask)506 driCopyContext(__DRIcontext *dest, __DRIcontext *src, unsigned long mask)
507 {
508     (void) dest;
509     (void) src;
510     (void) mask;
511     return GL_FALSE;
512 }
513 
514 /*@}*/
515 
516 
517 /*****************************************************************/
518 /** \name Context (un)binding functions                          */
519 /*****************************************************************/
520 /*@{*/
521 
522 static void dri_get_drawable(__DRIdrawable *pdp);
523 static void dri_put_drawable(__DRIdrawable *pdp);
524 
525 /**
526  * This function takes both a read buffer and a draw buffer.  This is needed
527  * for \c glXMakeCurrentReadSGI or GLX 1.3's \c glXMakeContextCurrent
528  * function.
529  */
driBindContext(__DRIcontext * pcp,__DRIdrawable * pdp,__DRIdrawable * prp)530 static int driBindContext(__DRIcontext *pcp,
531 			  __DRIdrawable *pdp,
532 			  __DRIdrawable *prp)
533 {
534     /*
535     ** Assume error checking is done properly in glXMakeCurrent before
536     ** calling driUnbindContext.
537     */
538 
539     if (!pcp)
540 	return GL_FALSE;
541 
542     /* Bind the drawable to the context */
543     pcp->driDrawablePriv = pdp;
544     pcp->driReadablePriv = prp;
545     if (pdp) {
546 	pdp->driContextPriv = pcp;
547 	dri_get_drawable(pdp);
548     }
549     if (prp && pdp != prp) {
550 	dri_get_drawable(prp);
551     }
552 
553     return pcp->driScreenPriv->driver->MakeCurrent(pcp, pdp, prp);
554 }
555 
556 /**
557  * Unbind context.
558  *
559  * \param scrn the screen.
560  * \param gc context.
561  *
562  * \return \c GL_TRUE on success, or \c GL_FALSE on failure.
563  *
564  * \internal
565  * This function calls __DriverAPIRec::UnbindContext, and then decrements
566  * __DRIdrawableRec::refcount which must be non-zero for a successful
567  * return.
568  *
569  * While casting the opaque private pointers associated with the parameters
570  * into their respective real types it also assures they are not \c NULL.
571  */
driUnbindContext(__DRIcontext * pcp)572 static int driUnbindContext(__DRIcontext *pcp)
573 {
574     __DRIdrawable *pdp;
575     __DRIdrawable *prp;
576 
577     /*
578     ** Assume error checking is done properly in glXMakeCurrent before
579     ** calling driUnbindContext.
580     */
581 
582     if (pcp == NULL)
583 	return GL_FALSE;
584 
585     /*
586     ** Call driUnbindContext before checking for valid drawables
587     ** to handle surfaceless contexts properly.
588     */
589     pcp->driScreenPriv->driver->UnbindContext(pcp);
590 
591     pdp = pcp->driDrawablePriv;
592     prp = pcp->driReadablePriv;
593 
594     /* already unbound */
595     if (!pdp && !prp)
596 	return GL_TRUE;
597 
598     assert(pdp);
599     if (pdp->refcount == 0) {
600 	/* ERROR!!! */
601 	return GL_FALSE;
602     }
603 
604     dri_put_drawable(pdp);
605 
606     if (prp != pdp) {
607 	if (prp->refcount == 0) {
608 	    /* ERROR!!! */
609 	    return GL_FALSE;
610 	}
611 
612 	dri_put_drawable(prp);
613     }
614 
615     pcp->driDrawablePriv = NULL;
616     pcp->driReadablePriv = NULL;
617 
618     return GL_TRUE;
619 }
620 
621 /*@}*/
622 
623 
dri_get_drawable(__DRIdrawable * pdp)624 static void dri_get_drawable(__DRIdrawable *pdp)
625 {
626     pdp->refcount++;
627 }
628 
dri_put_drawable(__DRIdrawable * pdp)629 static void dri_put_drawable(__DRIdrawable *pdp)
630 {
631     if (pdp) {
632 	pdp->refcount--;
633 	if (pdp->refcount)
634 	    return;
635 
636 	pdp->driScreenPriv->driver->DestroyBuffer(pdp);
637 	free(pdp);
638     }
639 }
640 
641 static __DRIdrawable *
driCreateNewDrawable(__DRIscreen * screen,const __DRIconfig * config,void * data)642 driCreateNewDrawable(__DRIscreen *screen,
643                      const __DRIconfig *config,
644                      void *data)
645 {
646     __DRIdrawable *pdraw;
647 
648     assert(data != NULL);
649 
650     pdraw = malloc(sizeof *pdraw);
651     if (!pdraw)
652 	return NULL;
653 
654     pdraw->loaderPrivate = data;
655 
656     pdraw->driScreenPriv = screen;
657     pdraw->driContextPriv = NULL;
658     pdraw->refcount = 0;
659     pdraw->lastStamp = 0;
660     pdraw->w = 0;
661     pdraw->h = 0;
662 
663     dri_get_drawable(pdraw);
664 
665     if (!screen->driver->CreateBuffer(screen, pdraw, &config->modes,
666                                       GL_FALSE)) {
667        free(pdraw);
668        return NULL;
669     }
670 
671     pdraw->dri2.stamp = pdraw->lastStamp + 1;
672 
673     return pdraw;
674 }
675 
676 static void
driDestroyDrawable(__DRIdrawable * pdp)677 driDestroyDrawable(__DRIdrawable *pdp)
678 {
679     /*
680      * The loader's data structures are going away, even if pdp itself stays
681      * around for the time being because it is currently bound. This happens
682      * when a currently bound GLX pixmap is destroyed.
683      *
684      * Clear out the pointer back into the loader's data structures to avoid
685      * accessing an outdated pointer.
686      */
687     pdp->loaderPrivate = NULL;
688 
689     dri_put_drawable(pdp);
690 }
691 
692 static __DRIbuffer *
dri2AllocateBuffer(__DRIscreen * screen,unsigned int attachment,unsigned int format,int width,int height)693 dri2AllocateBuffer(__DRIscreen *screen,
694 		   unsigned int attachment, unsigned int format,
695 		   int width, int height)
696 {
697     return screen->driver->AllocateBuffer(screen, attachment, format,
698                                           width, height);
699 }
700 
701 static void
dri2ReleaseBuffer(__DRIscreen * screen,__DRIbuffer * buffer)702 dri2ReleaseBuffer(__DRIscreen *screen, __DRIbuffer *buffer)
703 {
704     screen->driver->ReleaseBuffer(screen, buffer);
705 }
706 
707 
708 static int
dri2ConfigQueryb(__DRIscreen * screen,const char * var,unsigned char * val)709 dri2ConfigQueryb(__DRIscreen *screen, const char *var, unsigned char *val)
710 {
711    if (!driCheckOption(&screen->optionCache, var, DRI_BOOL))
712       return -1;
713 
714    *val = driQueryOptionb(&screen->optionCache, var);
715 
716    return 0;
717 }
718 
719 static int
dri2ConfigQueryi(__DRIscreen * screen,const char * var,int * val)720 dri2ConfigQueryi(__DRIscreen *screen, const char *var, int *val)
721 {
722    if (!driCheckOption(&screen->optionCache, var, DRI_INT) &&
723        !driCheckOption(&screen->optionCache, var, DRI_ENUM))
724       return -1;
725 
726     *val = driQueryOptioni(&screen->optionCache, var);
727 
728     return 0;
729 }
730 
731 static int
dri2ConfigQueryf(__DRIscreen * screen,const char * var,float * val)732 dri2ConfigQueryf(__DRIscreen *screen, const char *var, float *val)
733 {
734    if (!driCheckOption(&screen->optionCache, var, DRI_FLOAT))
735       return -1;
736 
737     *val = driQueryOptionf(&screen->optionCache, var);
738 
739     return 0;
740 }
741 
742 static unsigned int
driGetAPIMask(__DRIscreen * screen)743 driGetAPIMask(__DRIscreen *screen)
744 {
745     return screen->api_mask;
746 }
747 
748 /**
749  * swrast swapbuffers entrypoint.
750  *
751  * DRI2 implements this inside the loader with only flushes handled by the
752  * driver.
753  */
754 static void
driSwapBuffers(__DRIdrawable * pdp)755 driSwapBuffers(__DRIdrawable *pdp)
756 {
757     assert(pdp->driScreenPriv->swrast_loader);
758 
759     pdp->driScreenPriv->driver->SwapBuffers(pdp);
760 }
761 
762 /** Core interface */
763 const __DRIcoreExtension driCoreExtension = {
764     .base = { __DRI_CORE, 1 },
765 
766     .createNewScreen            = NULL,
767     .destroyScreen              = driDestroyScreen,
768     .getExtensions              = driGetExtensions,
769     .getConfigAttrib            = driGetConfigAttrib,
770     .indexConfigAttrib          = driIndexConfigAttrib,
771     .createNewDrawable          = NULL,
772     .destroyDrawable            = driDestroyDrawable,
773     .swapBuffers                = driSwapBuffers, /* swrast */
774     .createNewContext           = driCreateNewContext, /* swrast */
775     .copyContext                = driCopyContext,
776     .destroyContext             = driDestroyContext,
777     .bindContext                = driBindContext,
778     .unbindContext              = driUnbindContext
779 };
780 
781 /** DRI2 interface */
782 const __DRIdri2Extension driDRI2Extension = {
783     .base = { __DRI_DRI2, 4 },
784 
785     .createNewScreen            = dri2CreateNewScreen,
786     .createNewDrawable          = driCreateNewDrawable,
787     .createNewContext           = driCreateNewContext,
788     .getAPIMask                 = driGetAPIMask,
789     .createNewContextForAPI     = driCreateNewContextForAPI,
790     .allocateBuffer             = dri2AllocateBuffer,
791     .releaseBuffer              = dri2ReleaseBuffer,
792     .createContextAttribs       = driCreateContextAttribs,
793     .createNewScreen2           = driCreateNewScreen2,
794 };
795 
796 const __DRIswrastExtension driSWRastExtension = {
797     .base = { __DRI_SWRAST, 4 },
798 
799     .createNewScreen            = driSWRastCreateNewScreen,
800     .createNewDrawable          = driCreateNewDrawable,
801     .createNewContextForAPI     = driCreateNewContextForAPI,
802     .createContextAttribs       = driCreateContextAttribs,
803     .createNewScreen2           = driSWRastCreateNewScreen2,
804 };
805 
806 const __DRI2configQueryExtension dri2ConfigQueryExtension = {
807    .base = { __DRI2_CONFIG_QUERY, 1 },
808 
809    .configQueryb        = dri2ConfigQueryb,
810    .configQueryi        = dri2ConfigQueryi,
811    .configQueryf        = dri2ConfigQueryf,
812 };
813 
814 void
dri2InvalidateDrawable(__DRIdrawable * drawable)815 dri2InvalidateDrawable(__DRIdrawable *drawable)
816 {
817     drawable->dri2.stamp++;
818 }
819 
820 /**
821  * Check that the gl_framebuffer associated with dPriv is the right size.
822  * Resize the gl_framebuffer if needed.
823  * It's expected that the dPriv->driverPrivate member points to a
824  * gl_framebuffer object.
825  */
826 void
driUpdateFramebufferSize(struct gl_context * ctx,const __DRIdrawable * dPriv)827 driUpdateFramebufferSize(struct gl_context *ctx, const __DRIdrawable *dPriv)
828 {
829    struct gl_framebuffer *fb = (struct gl_framebuffer *) dPriv->driverPrivate;
830    if (fb && (dPriv->w != fb->Width || dPriv->h != fb->Height)) {
831       _mesa_resize_framebuffer(ctx, fb, dPriv->w, dPriv->h);
832       /* if the driver needs the hw lock for ResizeBuffers, the drawable
833          might have changed again by now */
834       assert(fb->Width == dPriv->w);
835       assert(fb->Height == dPriv->h);
836    }
837 }
838 
839 uint32_t
driGLFormatToImageFormat(mesa_format format)840 driGLFormatToImageFormat(mesa_format format)
841 {
842    switch (format) {
843    case MESA_FORMAT_B5G6R5_UNORM:
844       return __DRI_IMAGE_FORMAT_RGB565;
845    case MESA_FORMAT_B5G5R5A1_UNORM:
846       return __DRI_IMAGE_FORMAT_ARGB1555;
847    case MESA_FORMAT_B8G8R8X8_UNORM:
848       return __DRI_IMAGE_FORMAT_XRGB8888;
849    case MESA_FORMAT_B10G10R10A2_UNORM:
850       return __DRI_IMAGE_FORMAT_ARGB2101010;
851    case MESA_FORMAT_B10G10R10X2_UNORM:
852       return __DRI_IMAGE_FORMAT_XRGB2101010;
853    case MESA_FORMAT_B8G8R8A8_UNORM:
854       return __DRI_IMAGE_FORMAT_ARGB8888;
855    case MESA_FORMAT_R8G8B8A8_UNORM:
856       return __DRI_IMAGE_FORMAT_ABGR8888;
857    case MESA_FORMAT_R8G8B8X8_UNORM:
858       return __DRI_IMAGE_FORMAT_XBGR8888;
859    case MESA_FORMAT_L_UNORM8:
860    case MESA_FORMAT_R_UNORM8:
861       return __DRI_IMAGE_FORMAT_R8;
862    case MESA_FORMAT_L8A8_UNORM:
863    case MESA_FORMAT_R8G8_UNORM:
864       return __DRI_IMAGE_FORMAT_GR88;
865    case MESA_FORMAT_NONE:
866       return __DRI_IMAGE_FORMAT_NONE;
867    case MESA_FORMAT_B8G8R8A8_SRGB:
868       return __DRI_IMAGE_FORMAT_SARGB8;
869    default:
870       return 0;
871    }
872 }
873 
874 mesa_format
driImageFormatToGLFormat(uint32_t image_format)875 driImageFormatToGLFormat(uint32_t image_format)
876 {
877    switch (image_format) {
878    case __DRI_IMAGE_FORMAT_RGB565:
879       return MESA_FORMAT_B5G6R5_UNORM;
880    case __DRI_IMAGE_FORMAT_ARGB1555:
881       return MESA_FORMAT_B5G5R5A1_UNORM;
882    case __DRI_IMAGE_FORMAT_XRGB8888:
883       return MESA_FORMAT_B8G8R8X8_UNORM;
884    case __DRI_IMAGE_FORMAT_ARGB2101010:
885       return MESA_FORMAT_B10G10R10A2_UNORM;
886    case __DRI_IMAGE_FORMAT_XRGB2101010:
887       return MESA_FORMAT_B10G10R10X2_UNORM;
888    case __DRI_IMAGE_FORMAT_ARGB8888:
889       return MESA_FORMAT_B8G8R8A8_UNORM;
890    case __DRI_IMAGE_FORMAT_ABGR8888:
891       return MESA_FORMAT_R8G8B8A8_UNORM;
892    case __DRI_IMAGE_FORMAT_XBGR8888:
893       return MESA_FORMAT_R8G8B8X8_UNORM;
894    case __DRI_IMAGE_FORMAT_R8:
895       return MESA_FORMAT_R_UNORM8;
896    case __DRI_IMAGE_FORMAT_GR88:
897       return MESA_FORMAT_R8G8_UNORM;
898    case __DRI_IMAGE_FORMAT_SARGB8:
899       return MESA_FORMAT_B8G8R8A8_SRGB;
900    case __DRI_IMAGE_FORMAT_NONE:
901       return MESA_FORMAT_NONE;
902    default:
903       return MESA_FORMAT_NONE;
904    }
905 }
906 
907 /** Image driver interface */
908 const __DRIimageDriverExtension driImageDriverExtension = {
909     .base = { __DRI_IMAGE_DRIVER, 1 },
910 
911     .createNewScreen2           = driCreateNewScreen2,
912     .createNewDrawable          = driCreateNewDrawable,
913     .getAPIMask                 = driGetAPIMask,
914     .createContextAttribs       = driCreateContextAttribs,
915 };
916 
917 /* swrast copy sub buffer entrypoint. */
driCopySubBuffer(__DRIdrawable * pdp,int x,int y,int w,int h)918 static void driCopySubBuffer(__DRIdrawable *pdp, int x, int y,
919                              int w, int h)
920 {
921     assert(pdp->driScreenPriv->swrast_loader);
922 
923     pdp->driScreenPriv->driver->CopySubBuffer(pdp, x, y, w, h);
924 }
925 
926 /* for swrast only */
927 const __DRIcopySubBufferExtension driCopySubBufferExtension = {
928    .base = { __DRI_COPY_SUB_BUFFER, 1 },
929 
930    .copySubBuffer               = driCopySubBuffer,
931 };
932